As I am named I will add my thoughtts.
My problem is that after a lifetime of working outside day and night all year round I am now left with age related circulation problems leaving me with cold hands, especially feet and specifically toes. Winter riding can be great fun with a snowy off road ride on a sunny morning well worth the effort, and as an outside worker I Know how to dress for winter and for generally keeping warm without feeling restricted, layers are the answer, so I can easily keep my core temperiture stable but not my fingers and toes. . I have some shimano insulated boots which work well but still restrict me to an absolute maximum time of 1 hour if near zero degrees and 30 mins if below zero. Its a shame that heated grips/gloves are not an option on ebikes, but failing that I have tried battery operated heated insoles that were of no benefit and each year I keep looking for some with good reviews.
Has anyone any info on heated gloves/socks/insoles that actually work?
The problem being the power source needs to be big enough to work but small enough to have strapped to your legs.